CN117067583B - Accurate levelling device of 3D printing equipment and 3D printing equipment - Google Patents
Accurate levelling device of 3D printing equipment and 3D printing equipment Download PDFInfo
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- CN117067583B CN117067583B CN202311331753.6A CN202311331753A CN117067583B CN 117067583 B CN117067583 B CN 117067583B CN 202311331753 A CN202311331753 A CN 202311331753A CN 117067583 B CN117067583 B CN 117067583B
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- 238000010146 3D printing Methods 0.000 title claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims abstract description 52
- 238000000429 assembly Methods 0.000 claims abstract description 15
- 230000000712 assembly Effects 0.000 claims abstract description 15
- 238000007639 printing Methods 0.000 claims description 31
- 239000000919 ceramic Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Coating Apparatus (AREA)
Abstract
The invention discloses an accurate leveling device of 3D printing equipment and the 3D printing equipment, which comprise a bracket, a mounting box, a connecting piece, leveling capacitor assemblies, leveling rod assemblies, a circuit board, a display screen and a supporting and fixing rod.
Description
Technical Field
The invention belongs to the technical field of 3D printing equipment, and particularly relates to an accurate leveling device of 3D printing equipment and the 3D printing equipment.
Background
The 3D printing technology is that hot-melt type material wires are extruded from a spray head after being heated and melted, deposited on a printing working platform or a previous layer of solidified material, and solidified and formed after the temperature is lower than the solidification temperature of the material wires, finally a real object is generated, and for the 3D printing technology of the fused deposition rapid prototyping technology characterized by layer-by-layer accumulation, the levelness of the printing platform relative to the printing spray head directly determines the success or failure of the deposition and the formation of a first layer of a model on the printing platform, thereby determining the success or failure and the accuracy of whole model printing.
In the existing 3D actual printing, a constant distance should be kept between the printing platform and the nozzle to obtain a first layer with good effect, if the distance between the nozzle and the printing platform is too large, extruded melt wires cannot adhere to the platform well, a tiny gap is formed between the melt wires, which will lead to warping of the bottom edge of the workpiece, conversely, if the nozzle is too close to the platform, there will not be enough space for the melt wires to be extruded properly, thus resulting in insufficient extrusion, and ridges are easily formed between the melt wires, which will further lead to blockage of the extruder.
However, the printer is inclined or deformed due to installation errors, machine vibration, thermal stress release of the thermal bed and the like, so that in order to ensure printing effect, the printing platform needs to be leveled before printing, and the leveling technology of the traditional 3D printer for ensuring that a constant distance between the printing platform and the nozzle is kept is mainly realized by manually adjusting screws under the printing platform.
According to the 3D printer leveling mechanism provided by the publication No. CN217073378U, lifting cylinders are arranged at four corners of an operation table, leveling work is carried out by utilizing an air pressure lifting mode, whether the platform leveling is realized by manually adjusting screws under a printing platform or the leveling is carried out by the lifting cylinders, in order to achieve the purpose of accurate leveling, the leveling amplitude is required to be accurately known, in the prior art, whether the leveling amplitude is proper or not is judged by visual inspection or by adopting a mode of leveling while printing through a pre-printing effect, and repeated leveling and experiments are required to be carried out in the mode, so that the operation steps are complicated, the leveling accuracy is not accurate enough, and the adjusting efficiency is low.
Based on the above-mentioned problem, there is an urgent need in the art for a 3D printer that can accurately provide an accurate leveling device that adjusts the amplitude when leveling, to ensure the accuracy and effect of leveling.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
In order to solve the technical problems, the invention adopts the following technical scheme.
A precision leveling device for a 3D printing apparatus, comprising:
the bracket is formed by connecting two longitudinal and transverse connecting rods in a cross shape, and the bottoms of the two ends of the longitudinal connecting rod and the transverse connecting rod are respectively provided with a connecting piece;
the mounting box is fixed in the center of the bracket and internally provided with a circuit board;
the upper end of the connecting piece is fixed at the bottom of the bracket, and the lower end of the connecting piece is fixed with a leveling capacitor assembly;
the leveling capacitor assembly comprises a hollow box body, a fixed plate is fixed in the box body, a moving plate capable of moving up and down is arranged below the fixed plate, metal plates are fixed below the fixed plate and above the moving plate, the two metal plates form a leveling capacitor, a telescopic rod is fixed at the bottom of the moving plate, and the lower end of the telescopic rod extends to the outside of the box body and is fixed with a connecting plate;
the leveling rod assembly comprises a leveling rod, and the leveling rod is fixed at the bottom of the connecting plate;
the circuit board is integrated with a controller unit and two groups of mutually independent differential pulse width modulation circuits, wherein two differential capacitors of one group of differential pulse width modulation circuits are leveling capacitors in two leveling capacitor assemblies at the lower end of a longitudinal connecting rod, two differential capacitors of the other group of differential pulse width modulation circuits are leveling capacitors in two leveling capacitor assemblies at the lower end of a transverse connecting rod, and the controller unit is electrically connected with the differential pulse width modulation circuits and is used for measuring the output voltage of the two differential pulse width modulation circuits;
the display screen is fixed at the upper end of the bracket and is electrically connected with the controller unit and used for displaying the output voltages of the two differential pulse width modulation circuits;
the supporting and fixing rod is fixed at the center of the upper end of the bracket and is used for connecting a printing nozzle of the D printing equipment;
the telescopic rod is sleeved with a reset spring, one end of the reset spring is propped against the side face of the connecting plate, and the other end of the reset spring is propped against the outer side face of the box body.
Further, the connecting piece comprises a connecting screw rod and a threaded cylinder with an opening at the upper end, the upper end of the connecting screw rod is fixed at the bottom of the bracket, the lower end of the connecting screw rod is installed inside the threaded cylinder through threads, the threaded cylinder is fixed at the upper end of the box body, and a locking nut is installed on the connecting screw rod.
Further, a sliding rod is fixed on the inner side wall of the box body, a sliding groove is formed in the side edge of the moving plate, and the sliding groove is clamped on the sliding rod.
Further, the leveling rod assembly further comprises a hollow installation seat, a sliding groove is formed in the inner side of the installation seat, a sliding block is arranged on the side face of the upper end of the leveling rod, the upper end of the leveling rod extends to the installation seat, and the sliding block is clamped in the sliding groove.
Further, the inside of mount pad is fixed with piezoceramics sensor, and piezoceramics sensor is located the top of leveling pole, piezoceramics sensor and controller unit electric connection for measure the pressure of leveling pole that piezoceramics sensor received.
Further, the controller unit comprises a controller taking the STM32 embedded chip as a core and a power supply, wherein the power supply is electrically connected with the controller and used for providing a working power supply for the controller, and an analog-to-digital conversion module is integrated inside the controller.
Further, the differential pulse width modulation circuit comprises a comparator A1, a comparator A2 and a bistable flip-flop FF, wherein non-inverting input ends of the comparator A1 and the comparator A2 are connected with a controller unit, the controller unit provides reference voltage, inverting input ends of the comparator A1 and the comparator A2 are respectively connected with one ends of two leveling capacitors, the other ends of the leveling capacitors are grounded, output ends of the comparator A1 and the comparator A2 are respectively and electrically connected with two input ends of the bistable flip-flop FF, two output ends of the bistable flip-flop are respectively connected with a resistor R1 and a resistor R2, two ends of the resistor R1 and the resistor R2 are respectively connected with non-grounding ends of the two leveling capacitors in parallel, and the other ends of the resistor R1 and the resistor R2 are respectively electrically connected with the bistable controller unit to provide output voltage of the differential pulse width modulation circuit.
Further, a low-pass filter is also connected to the circuit between the output end of the bistable trigger and the controller unit.
The invention further provides 3D printing equipment, which comprises the 3D printer body and the accurate leveling device.
Compared with the prior art, the invention has the beneficial effects that:
when the leveling device is used, the spray head is pressed against the supporting and fixing rod, pressure is applied to the four leveling capacitor assemblies through the support, the lower parts of the leveling capacitor assemblies are placed on the printing platform, when the printing platform is in an inclined state, the pressure can cause the capacitance of the leveling capacitor assemblies below the longitudinal connecting rod and the horizontal connecting rod to be different, and the difference value of the capacitance is judged through the two differential pulse width modulation circuits, so that the angle of longitudinal inclination and the angle of horizontal inclination are quantitatively displayed through voltage, the inclination amplitude can be accurately known when the leveling is carried out, the leveling amplitude can be observed when the leveling is carried out, the leveling effect is more accurate, and inconvenience caused by repeated adjustment is avoided.
Drawings
FIG. 1 is a schematic diagram of the overall exploded construction of the present invention;
FIG. 2 is a schematic cross-sectional view of a connector and leveling capacitor assembly according to the present invention;
FIG. 3 is a schematic diagram of an exploded view of a leveling capacitor assembly according to the present invention;
FIG. 4 is a schematic exploded view of the leveling rod assembly of the present invention;
FIG. 5 is a schematic cross-sectional view of a leveling rod assembly according to the present invention;
FIG. 6 is a schematic view of the overall exploded construction of the present invention;
FIG. 7 is a schematic diagram of a system structure of a circuit board according to the present invention;
fig. 8 is a schematic diagram of a differential pwm circuit according to the present invention.
The correspondence between the reference numerals and the component names in the drawings is as follows:
the device comprises a bracket 10, a mounting box 20, a connecting piece 30, a connecting screw 31, a locking nut 32, a threaded cylinder 33, a leveling capacitor assembly 40, a box 41, a fixed plate 42, a moving plate 43, a metal plate 44, a telescopic rod 45, a connecting plate 46, a return spring 47, a sliding groove 48, a sliding rod 49, a leveling rod assembly 50, a leveling rod 51, a mounting seat 52, a piezoelectric ceramic sensor 53, a sliding block 54, a sliding groove 55, a circuit board 60, a controller unit 61, a differential pulse width modulation circuit 62, a display screen 70 and a supporting and fixing rod 80.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. The present invention provides the following examples.
As shown in fig. 1 to 8, this embodiment provides a technical solution:
the utility model provides a 3D printing apparatus's accurate levelling device, includes support 10, mounting box 20, connecting piece 30, leveling capacitor assembly 40, leveling rod assembly 50, circuit board 60, display screen 70 and supports solid pole 80, in this embodiment:
the support 10 is formed by crisscross connection of two connecting rods in a crisscross manner, two ends bottoms of the longitudinal connecting rod and the transverse connecting rod are respectively provided with a connecting piece 30, the upper end of the connecting piece 30 is fixed at the bottom of the support 10, the lower end of the connecting piece is fixed with a leveling capacitor assembly 40, two leveling capacitor assemblies 40 at the bottom of the longitudinal connecting rod are in a group and are used for detecting longitudinal inclination amplitude, two leveling capacitor assemblies 40 at the bottom of the transverse connecting rod are in a group and are used for detecting transverse inclination amplitude, and the longitudinal connecting rod and the transverse connecting rod are in the same horizontal plane.
The connecting piece 30 comprises a connecting screw 31 and a threaded cylinder 33 with an opening at the upper end, the upper end of the connecting screw 31 is fixed at the bottom of the bracket 10, the lower end of the connecting screw is installed inside the threaded cylinder 33 through threads, the threaded cylinder 33 is fixed at the upper end of the box 41, a lock nut 32 is installed on the connecting screw 31, the connecting screw 31 is provided with external threads, the threaded cylinder 33 is provided with internal threads, the two threads are meshed through threads, the lock nut 32 is provided with internal threads, when the connecting screw is screwed tightly, the connecting screw is abutted against the side surface of the threaded cylinder 33, the rotation of the threaded cylinder 33 is limited, when the lock nut 32 is loosened, the threaded cylinder 33 can move up and down through rotation, the length of the whole connecting piece 30 is finely adjusted, the height of the leveling capacitor assembly 40 is changed, and the heights of the four leveling capacitor assemblies 40 are consistent.
The leveling capacitor assembly 40 comprises a hollow box 41, a fixed plate 42 is fixed inside the box 41, a moving plate 43 capable of moving up and down is arranged below the fixed plate 42, metal plates 44 are fixed below the fixed plate 42 and above the moving plate 43, the two metal plates 44 form a leveling capacitor, the leveling capacitor takes the two metal plates 44 as polar plates, middle air is taken as a medium, a telescopic rod 45 is fixed at the bottom of the moving plate 43, the lower end of the telescopic rod 45 extends to the outside of the box 41 and is fixed with a connecting plate 46, a reset spring 47 is sleeved on the telescopic rod 45, one end of the reset spring 47 abuts against the side face of the connecting plate 46, the other end of the reset spring abuts against the outer side face of the box 41, the connecting plate 46 drives the moving plate 43 to move when the leveling rod 51 at the bottom is extruded, the distance between the two metal plates 44 is changed, and the capacitance of the corresponding leveling capacitor assembly 40 is changed.
In this embodiment, a sliding rod 49 is fixed on the inner side wall of the case 41, a sliding groove 48 is provided on the side edge of the moving plate 43, the sliding groove 48 is clamped on the sliding rod 49, the sliding groove 48 and the sliding rod 49 play a guiding role on the movement of the moving plate 43, so that the moving direction of the moving plate 43 can only move up and down, and the movement is smoother.
The leveling rod assembly 50 comprises a leveling rod 51, the leveling rod 51 is fixed at the bottom of the connecting plate 46, the leveling rod assembly 50 further comprises a hollow installation seat 52, a sliding groove 55 is formed in the inner side of the installation seat 52, a sliding block 54 is arranged on the side face of the upper end of the leveling rod 51, the upper end of the leveling rod 51 extends to the installation seat 52, the sliding block 54 is clamped in the sliding groove 55, and after the leveling rod 51 receives pressure extrusion, the connecting plate 46 is pushed upwards to move.
The mounting box 20 is fixed in the center of the bracket 10, a circuit board 60 is mounted in the mounting box, a controller unit 61 and two sets of mutually independent differential pulse width modulation circuits 62 are integrated on the circuit board 60, wherein two differential capacitors of one set of differential pulse width modulation circuits 62 are leveling capacitors in two leveling capacitor assemblies 40 at the lower end of a longitudinal connecting rod, two differential capacitors of the other set of differential pulse width modulation circuits 62 are leveling capacitors in two leveling capacitor assemblies 40 at the lower end of a transverse connecting rod, and the controller unit 61 is electrically connected with the differential pulse width modulation circuits 62 and is used for measuring output voltages of the two differential pulse width modulation circuits 62.
In this embodiment, the print nozzle of the 3D printing apparatus vertically presses the supporting rod 80 downward, the supporting rod 80 vertically presses the support 10 downward, the bottom of the leveling capacitor assembly 40 is placed on the printing platform through the leveling rod assembly 50, if the printing platform is inclined at this time, the downward pressure will cause the capacitors formed by the leveling capacitor assemblies 40 to be not identical, so that the output voltages of the differential pulse width modulation circuits 62 are different, and therefore, the leveling is assisted by detecting the inclination through the assistance of the output voltages.
In this embodiment, the differential pulse width modulation circuit 62 includes a comparator A1, a comparator A2 and a bistable flip-flop FF, the non-inverting input ends of the comparator A1 and the comparator A2 are connected to the controller unit 61, the controller unit 61 provides a reference voltage, the inverting input ends of the comparator A1 and the comparator A2 are respectively connected to one ends of two leveling capacitors, the other ends of the leveling capacitors are grounded, the output ends of the comparator A1 and the comparator A2 are respectively electrically connected to the two input ends of the bistable flip-flop FF, the two output ends of the bistable flip-flop are respectively connected to a resistor R1 and a resistor R2, the two ends of the resistor R1 and the resistor R2 are respectively connected to the non-grounding ends of the two leveling capacitors, the two output ends of the bistable flip-flop are electrically connected to the controller unit 61, as shown in fig. 7 to 8, ur is a reference voltage, uo is an output voltage of the differential pulse width modulation circuit 62, and C1, C2 and C3 and C4 are equivalent capacitors 40.
In this embodiment, a low-pass filter is further connected to a circuit between the output end of the bistable flip-flop and the controller unit 61, and A3 shown in fig. 7 to 8 is the low-pass filter.
In this embodiment, the piezoelectric ceramic sensor 53 is fixed in the mounting seat 52, and the piezoelectric ceramic sensor 53 is located above the leveling rod 51, where the piezoelectric ceramic sensor 53 is electrically connected to the controller unit 61, and is used to measure the pressure of the leveling rod 51 received by the piezoelectric ceramic sensor 53, when the whole device works, if the printing platform is in an inclined state, after compensation is performed through the leveling capacitor assembly 40, the pressure received by the leveling rod 51 at the bottom should be the same, and at this time, it can be determined whether the height compensation of the leveling capacitor assembly 40 is in place through the four piezoelectric ceramic sensors 53.
The controller unit 61 includes a controller and a power supply using the STM32 embedded chip as a core, where the power supply is electrically connected to the controller and is used to provide a working power supply for the controller, the controller is internally integrated with an analog-to-digital conversion module, the analog-to-digital conversion module can convert analog quantities such as voltage and pressure into digital quantities, the display screen 70 is fixed at the upper end of the bracket 10 and is electrically connected to the controller unit 61 and is used to display the output voltages of the two differential pulse width modulation circuits 62, and the display screen 70 is also used to display parameters of the four piezoelectric ceramic sensors 53.
In this embodiment, the fixing lever 80 is fixed at the center of the upper end of the bracket 10 for connecting the printing nozzle of the 3D printing apparatus.
The invention further provides 3D printing equipment, which comprises the 3D printer body and the accurate leveling device.
The application principle of the invention is as follows:
before use, the relative positions of the screw thread cylinder 33 and the locking nut 32 are adjusted by rotating the screw thread cylinder, so that the height of the whole connecting piece 30 is changed, and the bottom of each leveling rod 51 is ensured to be consistent;
then the whole device is placed on a printing platform, the printing nozzle of the printing equipment is moved to be propped against the propping and fixing rod 80, pressure is applied to the whole bracket 10 through the propping and fixing rod 80, and if the printing platform is inclined at this time, the downward pressure can cause the capacitance formed by each leveling capacitor assembly 40 to be not identical, so that the output voltage of the differential pulse width modulation circuit 62 is different;
the inclination condition of the printing platform can be known by observing the numerical value of the display screen 70, and then the accurate leveling of the platform is realized by screws or air cylinders under the printing platform in the prior art; before leveling, the parameters of the piezoceramic sensors 53 are checked, and if the parameters are inconsistent, the height of the connector 30 needs to be readjusted.
The foregoing is a further elaboration of the present invention in connection with the detailed description, and it is not intended that the invention be limited to the specific embodiments shown, but rather that a number of simple deductions or substitutions be made by one of ordinary skill in the art without departing from the spirit of the invention, should be considered as falling within the scope of the invention as defined in the appended claims.
Claims (7)
1. Accurate levelling device of 3D printing equipment, its characterized in that includes:
the bracket (10) is formed by connecting two longitudinal and transverse connecting rods in a cross shape, and the bottoms of the two ends of the longitudinal connecting rod and the transverse connecting rod are respectively provided with a connecting piece (30);
a mounting box (20), wherein the mounting box (20) is fixed at the center of the bracket (10) and internally provided with a circuit board (60);
the upper end of the connecting piece (30) is fixed at the bottom of the bracket (10), and the lower end of the connecting piece (30) is fixed with a leveling capacitor assembly (40);
the leveling capacitor assembly (40), the leveling capacitor assembly (40) comprises a box body (41) with a hollow inside, a fixed plate (42) is fixed inside the box body (41), a moving plate (43) capable of moving up and down is arranged below the fixed plate (42), metal plates (44) are fixed below the fixed plate (42) and above the moving plate (43), the two metal plates (44) form a leveling capacitor, a telescopic rod (45) is fixed at the bottom of the moving plate (43), and the lower end of the telescopic rod (45) extends to the outside of the box body (41) and is fixed with a connecting plate (46);
the leveling rod assembly (50), the leveling rod assembly (50) comprises a leveling rod (51), and the leveling rod (51) is fixed at the bottom of the connecting plate (46);
the circuit board (60), integrate the controller unit (61) and two groups of mutually independent differential pulse width modulation circuits (62) on the circuit board (60), wherein two differential capacitances of one group of differential pulse width modulation circuits (62) are leveling capacitances in two leveling capacitance assemblies (40) of the lower end of the longitudinal connecting rod, two differential capacitances of another group of differential pulse width modulation circuits (62) are leveling capacitances in two leveling capacitance assemblies (40) of the lower end of the transverse connecting rod, the electrical connection of the controller unit (61) and the differential pulse width modulation circuits (62) is used for measuring the output voltage of the two differential pulse width modulation circuits (62);
the display screen (70) is fixed at the upper end of the bracket (10) and is electrically connected with the controller unit (61) for displaying the output voltages of the two differential pulse width modulation circuits (62);
the supporting and fixing rod (80) is fixed at the center of the upper end of the bracket (10) and is used for connecting a printing nozzle of the 3D printing equipment;
the telescopic rod (45) is sleeved with a reset spring (47), one end of the reset spring (47) is propped against the side surface of the connecting plate (46), the other end of the reset spring is propped against the outer side surface of the box body (41), the controller unit (61) comprises a controller taking an STM32 embedded chip as a core and a power supply, the power supply is electrically connected with the controller and is used for providing a working power supply for the controller, and an analog-digital conversion module is integrated in the controller;
the differential pulse width modulation circuit (62) comprises a comparator A1, a comparator A2 and a bistable flip-flop FF, wherein non-inverting input ends of the comparator A1 and the comparator A2 are connected with a controller unit (61), the controller unit (61) provides reference voltage, inverting input ends of the comparator A1 and the comparator A2 are respectively connected with one ends of two leveling capacitors, the other ends of the leveling capacitors are grounded, output ends of the comparator A1 and the comparator A2 are respectively and electrically connected with two input ends of the bistable flip-flop FF, two output ends of the bistable flip-flop are respectively connected with a resistor R1 and a resistor R2, two ends of the resistor R1 and the resistor R2 are respectively connected with non-grounding ends of the two leveling capacitors in parallel, and two output ends of the bistable flip-flop are electrically connected with the controller unit (61) to provide output voltage of the differential pulse width modulation circuit (62).
2. The precise leveling device of the 3D printing equipment according to claim 1, wherein the connecting piece (30) comprises a connecting screw (31) and a threaded cylinder (33) with an opening at the upper end, the upper end of the connecting screw (31) is fixed at the bottom of the bracket (10), the lower end of the connecting screw is arranged inside the threaded cylinder (33) through threads, the threaded cylinder (33) is fixed at the upper end of the box body (41), and a locking nut (32) is arranged on the connecting screw (31).
3. The precise leveling device of the 3D printing equipment according to claim 1, wherein a sliding rod (49) is fixed on the inner side wall of the box body (41), a sliding groove (48) is formed in the side edge of the moving plate (43), and the sliding groove (48) is clamped on the sliding rod (49).
4. The precise leveling device of the 3D printing equipment according to claim 1, wherein the leveling rod assembly (50) further comprises a hollow mounting seat (52), a sliding groove (55) is formed in the inner side of the mounting seat (52), a sliding block (54) is arranged on the side face of the upper end of the leveling rod (51), the upper end of the leveling rod (51) extends to the mounting seat (52), and the sliding block (54) is clamped in the sliding groove (55).
5. The precise leveling device of the 3D printing equipment according to claim 4, wherein a piezoelectric ceramic sensor (53) is fixed in the mounting seat (52), the piezoelectric ceramic sensor (53) is located above the leveling rod (51), and the piezoelectric ceramic sensor (53) is electrically connected with the controller unit (61) and is used for measuring the pressure of the leveling rod (51) received by the piezoelectric ceramic sensor (53).
6. The precise leveling device of the 3D printing apparatus according to claim 1, wherein a low pass filter is further connected to the circuit between the output of the bistable flip-flop and the controller unit (61).
7. A 3D printing apparatus, characterized in that the 3D printing apparatus comprises a 3D printer body and the precision leveling device according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311331753.6A CN117067583B (en) | 2023-10-16 | 2023-10-16 | Accurate levelling device of 3D printing equipment and 3D printing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311331753.6A CN117067583B (en) | 2023-10-16 | 2023-10-16 | Accurate levelling device of 3D printing equipment and 3D printing equipment |
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| CN117067583A (en) | 2023-11-17 |
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